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简介:
类型一:(注意:一定要括号外的数分别乘括号里的两个数,再把积相加)
(40+8)×25
=40×25+8×25
=1000+200
=1200
36×(100+50)
=36×100+36×50
=3600+1800
=5400
类型二:(注意:两个积中相同的因数只能写一次)
36×34+36×66
=36×(34+66)
=36×100
=3600
75×23+25×23
=23×(75+25)
=23×100
=2300
63×43+57×63
=63×(43+57)
=63×100
=6300
类型三:(提示:把102看作100+2;81看作80+1,再用乘法分配律)
78×102
=78×(100+2)
=78×100+78×2
=7800+156
=7956
75×41
=75×(40+1)
=75×40+75
=3000+75
=3075
125×81
=125×(80+1)
=125×80+125×1
=10000+125
=10125